单项选择题

We are told that adders are ______.

A．normally friendly towards people
B．unlikely to bite except in self-defense
C．aggressive towards anyone in their territory
D．not afraid of human beings

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单项选择题

If a adder hears you approaching, it will usually ______.

A．move out of your path
B．take no notice of you at all
C．disappear very quickly
D．wait until you are close and then attack

单项选择题

Which of the following titles best reflects the main focus of the passage

A．A Survey of Three Mexican American Families at Work in Texas.
B．Innovative Career Women: Effects on Family Unity.
C．Changes in the Life Styles of Migrant Mexican American Families.
D．Farming of Family: The Unavoidable Choice for Migrant Farm Workers.